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Java cache library mapdb expire max size


By : Minoru Osawa
Date : October 14 2020, 02:21 PM
Any of those help The HTreeMap documentation says:
code :
HTreeMap cache = db
    .hashMap("cache")
    .expireMaxSize(1000)
    .create();


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java cache hashmap expire daily


By : user3858966
Date : March 29 2020, 07:55 AM
This might help you Although the other suggestions can work to time the expiration, it is important to note that :
Expiration of the hashmap can be done lazily
code :
if (currentTime> nextMidTime)
      this.clear();
      //Lets assume there is a getNextMidnight method which tells us the nearest midnight time after a given time stamp.  
      nextMidTime=getNextMidnight(System.currentTimeInMilliseconds);

MapDB collection size issue


By : Mor Shternberg
Date : March 29 2020, 07:55 AM
Hope this helps MapDB needs to traverse all entries in collections to count it. You may store count in external Atomic.Long and retrieve it separately, an example is here:
https://github.com/jankotek/MapDB/blob/master/src/test/java/examples/Map_Size_Counter.java

WildFly 11/Java EE 7/JSR 107: caching - what's the best way to cache information and let it expire automatically?


By : Arlenny Andrea
Date : March 29 2020, 07:55 AM
hope this fix your issue I'm not sure it is the "best" way but I've been using the Google Guava cache in Wildfly (8 through 10 but hopefully still applicable). For me I'm caching Oauth tokens because of a very slow auth server. My code looks something like:
code :
private static LoadingCache<String, MyPrincipal> tokenCacheMap;

@PostConstruct
private void postConstruct() {
    tokenCacheMap = CacheBuilder.newBuilder()
            .expireAfterAccess(15, TimeUnit.MINUTES)
            .build(
                    new CacheLoader<String, MyUserPrincipal>() {
                        @Override
                        public MyUserPrincipal load(String token) {
                            MyUserPrincipal myUserPrincipal = getUserFromToken(token);

                            if( myUserPrincipal != null ) {
                                myUserPrincipal.setToken(token);
                                return myUserPrincipal;
                            }

                            throw new SecurityException("token is not valid");
                        }
                    }
            );
}

//
// later in the code...
//
MyUserPrincipal myUserPrincipal = tokenCacheMap.get(token);

MapDb treeset key doesn't come with expire property


By : user1604393
Date : March 29 2020, 07:55 AM
wish of those help Finally we discard the option to use mapdb as offheap cache because its performance doesn't fit for our requirement. I have done the benchmark with ohc and result below:
code :
Benchmark                     Mode  Cnt       Score       Error  Units
OhcBenchmark.testOhcGet      thrpt   20  923806.733 ± 19007.928  ops/s
OhcBenchmark.testOhcHGet     thrpt   20  242194.462 ± 11365.323  ops/s
OhcBenchmark.testOhcHGetAll  thrpt   20  265504.651 ± 15110.371  ops/s
OhcBenchmark.testOhcHSet     thrpt   20  204028.508 ± 59620.923  ops/s
OhcBenchmark.testOhcSAdd     thrpt   20   10097.188 ±   607.277  ops/s
OhcBenchmark.testOhcSet      thrpt   20  417034.685 ± 69965.252  ops/s
OhcBenchmark.testOhcSmember  thrpt   20  329536.900 ± 15128.885  ops/s
OhcBenchmark.testOhcZAdd     thrpt   20  222422.422 ± 33836.662  ops/s
OhcBenchmark.testOhcZRange   thrpt   20  155268.857 ±  5373.339  ops/s


Benchmark                              Mode  Cnt      Score      Error  Units
MapdbCacheBenchmark.testMapdbGet      thrpt   20  43376.407 ± 6046.811  ops/s
MapdbCacheBenchmark.testMapdbHGet     thrpt   20  45982.205 ± 2212.897  ops/s
MapdbCacheBenchmark.testMapdbHGetAll  thrpt   20  48149.936 ± 1819.886  ops/s
MapdbCacheBenchmark.testMapdbHSet     thrpt   20  18269.013 ± 1133.118  ops/s
MapdbCacheBenchmark.testMapdbSAdd     thrpt   20    246.944 ±   31.502  ops/s
MapdbCacheBenchmark.testMapdbSet      thrpt   20  28922.292 ± 1618.363  ops/s
MapdbCacheBenchmark.testMapdbSmember  thrpt   20  50328.641 ± 3519.970  ops/s
MapdbCacheBenchmark.testMapdbZAdd     thrpt   20  14729.551 ±  658.754  ops/s
MapdbCacheBenchmark.testMapdbZRange   thrpt   20  37038.027 ± 1795.458  ops/s

Is there a Java library the can cache data in memory or disk depending on the size of the data?


By : Alekzandre
Date : March 29 2020, 07:55 AM
it should still fix some issue The Heritix project includes a class called RecordingOutputStream. From the javadocs:
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